React Native - Swift Native Modules

RCTSwiftBridgeModule.h

#import <Foundation/Foundation.h>
#import "RCTBridgeModule.h"

#define RCT_EXTERN_MODULE(objc_name, objc_supername) \
  RCT_EXTERN_REMAP_MODULE(objc_name, objc_name, objc_supername)

#define RCT_EXTERN_REMAP_MODULE(js_name, objc_name, objc_supername) \
  objc_name : objc_supername \
  @end \
  @interface objc_name (RCTExternModule) <RCTBridgeModule> \
  @end \
  @implementation objc_name (RCTExternModule) \
  RCT_EXPORT_MODULE(js_name)

#define RCT_EXTERN_METHOD(method) \
  RCT_EXTERN_REMAP_METHOD(, method)

#define RCT_EXTERN_REMAP_METHOD(js_name, method) \
  - (void)__rct_export__##method { \
    __attribute__((used, section("__DATA,RCTExport"))) \
    __attribute__((__aligned__(1))) \
    static const char *__rct_export_entry__[] = { __func__, #method, #js_name }; \
  }

SwiftReactModule.swift

import Foundation

@objc(SwiftReactModule)
class SwiftReactModule: NSObject {
    
    @objc func printMessage(message: String!) {
        println("SwiftReactModule::printMessage => \(message)")
    }
    
}

SwiftReactModuleExports.m

#import "RCTSwiftBridgeModule.h"

@interface RCT_EXTERN_MODULE(SwiftReactModule, NSObject)

RCT_EXTERN_METHOD(printMessage:(NSString *)message)

@end

I am trying to write module in Swift and I tried 2 ways to link it to my main react-native app:

1st attempt

I tried the documentation in native modules setup but when I try to add new swift code I am getting errors when adding swift code as it written in set up section

2nd attempt

If I follow the guide I steps 1-4 and than tries to link it to my main react-native project than:

1. I don't have static library file - which I learned that swift does not support.
2. I can't link the project as describe in the example above by @zxcpoiu - I am using Xcode 10 and I don't have Objective-C Bridging Header in the build settings.

How can we integrate third party swift packages to the native modules? @robertjpayne Can you explain with example? Is there a need for adding Package.swift or Swift Package Manager would work?